把一个BufferedImage图像转换为数组
BufferedImage srcImage = ImageIO.read(new File("c:/**.jpg"));
byte[] data = ((DataBufferByte) srcImage.getData().getDataBuffer()).getData();
截取屏幕图片
BufferedImage srcImage = robot.createScreenCapture(rec);
用字节数组来保存图片,保存到输出流
BufferedImage bi=ImageIO.read(new ByteArrayInputSream(byte[]);
ImageIO.write(bufferedImage,"gif",new ByteArrayOutputStream(new byte[20000]));